EN8800GT Game Restart

I purchased an ASUS EN8800GT, (along with a new mobo and RAM) and installed it in my computer. Everythings been fine until I try to run a game, in which I get a blue screen saying my computer has been shut down to prevent damage, then it gets rebooted. I get an error message:

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I have downloaded and installed the video drivers, as well as installed the ones that came with the motherboard.